Ok so we will start from Rank upgrade . (Requires lvl60(or lvl50))

2 new icons will apear .

First icon which looks like someone's kidney is.

By pressing this you will enter into mini-game .

1. Current amount of red crystals you have (Required to upgrade SS rank member to SSS)
2. Current amount of orange crystals you have (Required to upgrade S rank member to SS)
3. Amount of crystal you get by pressing [6.] button
4. Amount of prestige you get by pressing [6.] button
5. Amount of silver you get by pressing [6.] button
6. Game starting button
7. Increase gain by 4x and 9x by paying 40gold and 90gold (Thorvald knows better)
Each day you have 10 tries . You can get 2x orange or 2 red crystals .

Also each daily task milestone gives you 2 orange crystals . (I am not vip so can't tell more)
Next is member upgrade . By pressing icon which is displayed down .

Upgrade member interface

So here is only 1 button which upgrades member rank.
So the requirements to upgrade are